Liver, postmortem, patient I. (a) A large juxtahilar mass consists in part of lymphoproliferative disease and infarction. (b) The presumably lymphoid proliferation is perivascular, angiocentric, and angioinvasive. × 150. (c) The wall of a hepatic artery is infiltrated and destroyed by the atypical cellular proliferation. × 350. (d) The cells did not react with B cell, T cell, or monocyte markers. S100 reveals a nerve, but the cells are unreactive. They are morphologically different from the plasmacytoid elements that were still recognizable elsewhere. × 660.